Phase 3: strong flyers only spawn in high-level zones

- tools/zone_spawns.py: a species ridable through the air with top
  speed >= 60 or top stamina >= 85 never spawns in a zone whose band
  starts below Lv 30; lines that start as one are only placed in such
  zones, and the tool refuses to write pools that break the rule.
  Drampa moves to Sunscorch; Aerodactyl is fossil-only; Salamence never
  spawns wild (Bagon and Shelgon stay in the Dripstone caves).
- Ride stats stay Cobblemon's until play-tested (species_additions can
  override riding later).
- Phase 3 checklist: all steps in, approval checkpoint for Adrian.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

datapacks/core/data/cobblesurvival/guardians/westmarch.json

@@ -1,7 +1,7 @@
 {
  "_comment": "Generated by tools/zone_spawns.py from world/zones.json; do not edit by hand.",
  "zone": "westmarch",
- "pokemon": "pinsir level=30 uncatchable=yes",
+ "pokemon": "scyther level=30 uncatchable=yes",
  "scale": 1.5,
  "drops": [
   {